"operational_status"=>"out_of_order","seamark:type"=>"gate","width"=>"6"
"seamark:type"=>"gate","year_of_construction"=>"1897"
"lock_name"=>"Sluis II Veenhuizersluis","operational_status"=>"out_of_order","seamark:type"=>"gate","width"=>"6"
"lock_name"=>"Sluis III Friesche Schut","material"=>"concrete","operational_status"=>"out_of_order","seamark:type"=>"gate"